Its just a suggestion but my Utorent has increased it's speed by choosing the 'limited upload and download rates' selection and specifying a value of 999999 in their respective boxes.
I previously had the scheduler on 'full speed' and it was very, very slow..
In fact the same file has just gone from 2.5kb/s ro 64kb/s.
Give it try, I can't guarantee it will work with yours, because I have have been tweeking this all week, and changing this and the scheduler speed in the hours grid to 'limited' worked for me.
All the best
Dual Pro Linkstation Firmware 1.65
If you want to know what other tweeks may have helped me and may also help you, let me know.